code: def test_dimension_string_not_in_element(self):
      self.assertFalse("D" in self.element)
  
file_path: holoviews/holoviews/tests/core/test_element.py
imports: from holoviews.core import Dimension, Element
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 7 for calling the ElementTests obj's underlying member method code with example usage: obj.test_dimension_string_not_in_element() without return types